CVE-2011-2895 (GCVE-0-2011-2895)
Vulnerability from cvelistv5 – Published: 2011-08-19 17:00 – Updated: 2024-08-06 23:15
VLAI
EPSS
VEX
Summary
The LZW decompressor in (1) the BufCompressedFill function in fontfile/decompress.c in X.Org libXfont before 1.4.4 and (2) compress/compress.c in 4.3BSD, as used in zopen.c in OpenBSD before 3.8, FreeBSD, NetBSD 4.0.x and 5.0.x before 5.0.3 and 5.1.x before 5.1.1, FreeType 2.1.9, and other products, does not properly handle code words that are absent from the decompression table when encountered, which allows context-dependent attackers to trigger an infinite loop or a heap-based buffer overflow, and possibly execute arbitrary code, via a crafted compressed stream, a related issue to CVE-2006-1168 and CVE-2011-2896.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
38 references
Date Public
2011-08-10 00:00
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"value": "The LZW decompressor in (1) the BufCompressedFill function in fontfile/decompress.c in X.Org libXfont before 1.4.4 and (2) compress/compress.c in 4.3BSD, as used in zopen.c in OpenBSD before 3.8, FreeBSD, NetBSD 4.0.x and 5.0.x before 5.0.3 and 5.1.x before 5.1.1, FreeType 2.1.9, and other products, does not properly handle code words that are absent from the decompression table when encountered, which allows context-dependent attackers to trigger an infinite loop or a heap-based buffer overflow, and possibly execute arbitrary code, via a crafted compressed stream, a related issue to CVE-2006-1168 and CVE-2011-2896."
},
{
"lang": "es",
"value": "El descompresor en LZW en (1) la funci\u00f3n BufCompressedFill en fontfile/decompress.c en X.Org libXfont antes de la versi\u00f3n v1.4.4 y (2) compress/compress.c en 4.3BSD, tal y como se utiliza en zopen.c en OpenBSD antes de la versi\u00f3n v3.8, FreeBSD, NetBSD, FreeType v2.1.9, y otros productos, no controla correctamente las palabras de c\u00f3digo ausentes de la tabla de descompresi\u00f3n, lo que permite provocar un bucle infinito o un desbordamiento de b\u00fafer basado en memoria din\u00e1mica (heap) a atacantes (dependiendo del contexto) y posiblemente ejecutar c\u00f3digo de su elecci\u00f3n a trav\u00e9s de un flujo comprimido debidamente modificado. Se trata de un problema relacionado con los CVE-2006-1168 y CVE-2011 2896."
}
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"descriptions": [
{
"lang": "en",
"value": "The LZW decompressor in (1) the BufCompressedFill function in fontfile/decompress.c in X.Org libXfont before 1.4.4 and (2) compress/compress.c in 4.3BSD, as used in zopen.c in OpenBSD before 3.8, FreeBSD, NetBSD 4.0.x and 5.0.x before 5.0.3 and 5.1.x before 5.1.1, FreeType 2.1.9, and other products, does not properly handle code words that are absent from the decompression table when encountered, which allows context-dependent attackers to trigger an infinite loop or a heap-based buffer overflow, and possibly execute arbitrary code, via a crafted compressed stream, a related issue to CVE-2006-1168 and CVE-2011-2896."
},
{
"lang": "es",
"value": "El descompresor en LZW en (1) la funci\u00f3n BufCompressedFill en fontfile/decompress.c en X.Org libXfont antes de la versi\u00f3n v1.4.4 y (2) compress/compress.c en 4.3BSD, tal y como se utiliza en zopen.c en OpenBSD antes de la versi\u00f3n v3.8, FreeBSD, NetBSD, FreeType v2.1.9, y otros productos, no controla correctamente las palabras de c\u00f3digo ausentes de la tabla de descompresi\u00f3n, lo que permite provocar un bucle infinito o un desbordamiento de b\u00fafer basado en memoria din\u00e1mica (heap) a atacantes (dependiendo del contexto) y posiblemente ejecutar c\u00f3digo de su elecci\u00f3n a trav\u00e9s de un flujo comprimido debidamente modificado. Se trata de un problema relacionado con los CVE-2006-1168 y CVE-2011 2896."
}
],
"id": "CVE-2011-2895",
"lastModified": "2026-04-29T01:13:23.040",
"metrics": {
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{
"acInsufInfo": false,
"baseSeverity": "HIGH",
"cvssData": {
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"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "COMPLETE",
"baseScore": 9.3,
"confidentialityImpact": "COMPLETE",
"integrityImpact": "COMPLETE",
"vectorString": "AV:N/AC:M/Au:N/C:C/I:C/A:C",
"version": "2.0"
},
"exploitabilityScore": 8.6,
"impactScore": 10.0,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
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}
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}
],
"sourceIdentifier": "secalert@redhat.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-119"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2025-11-21T12:56:14+00:00",
"cve": "CVE-2011-2895",
"id": "CVE-2011-2895",
"initial_release_date": "2011-08-10T00:00:00+00:00",
"product_status:fixed": "702",
"product_status:known_affected": "2",
"product_status:known_not_affected": "21",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "BSD compress LZW decoder buffer overflow",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2011/cve-2011-2895.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-02T12:59:59Z",
"cve": "CVE-2011-2895",
"id": "CVE-2011-2895",
"initial_release_date": "2023-02-15T05:51:57Z",
"product_status:known_affected": "394",
"product_status:recommended": "345",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2011-2895",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2011-2895.json",
"version": "32"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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